[washington blue]

My exhaust fan is a belt driven fan, the electric motor is not in the air flow and cannot get shop dirt or overspray mist on it, so there are no electrical spark or dirty motor shorting out worries. The electric motor is outside the building, protected by a separate roof to keep the elements from weathering it and the belt.
This way, no matter how dirty it might get inside the shop from grinding, welding, torching, painting or whatever, the motor and belt are outside and clean. I've seen guys use house fans and even a bin fan to exhaust fumes and it makes me nervous. I've also seen guys use nothing and that's worse, imo.
I've been wondering about the saran wrap working, I saw a guy use it when spray foaming my basement and it has me curious. I have replaceable films from "Hobbyair", the company I got the setup from, but they are not perfect.